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(Kalela 1939 p. 402), although there the vegetation type seems
to have advanced beyond the pioneer stage and has a much larger
niunber of species than encountered here.
81. Eriopliorum Seheuchzeri — Calamagrostis neglecta sociation
(Tah. XIX A-B 1-2)
Observations of this sociation are from Amardalur and Hvanna-
lindir. It is widely distributed in both these areas as far as the
conditions permit. In both cases the character species are predomi-
nant, but E. angustifolium has colonized the areas to some extent.
Both Carex maritima and Juncus balticus occur in analysis 1, but
otherwise the scarcity of species is notable. The biological spectrum
is similar in all E. Scheuchzeri sociations; the E. percentage is
rather high in the highland vegetation. The life forms are fairly
evenly distributed among three groups, but the G percentage is
generally lowest. The sand is so loose in both areas as to make
crossing difficult, but the sociation grew exclusively in narrow
strips or belts alongside streams and ponds.
82. E. Scheuchzeri — Calamagrostis neglecta — Equisetum
arvense sociation (Tah. XIX A-B 3-4)
Both the analyses are made at Kýlingar on the border of a sandy
flói tract subject to water seepage, both from the flói area and from
springs, so that the conditions resemble those which prevail in
Arnardalur and Hvannalindir, the only difference being that here
E. arvense and Agrostis stolonifera are nearly as conspicuous as
Calamagrostis neglecta. There is no lake bottom vegetation here
and no humus formation.
83. E. Scheuchzeri — Agrostis stolonifera sociation
(Tah. XIX A-B 5)
The observation was made at Brunnavatn in Kaldidalur. The
topography is as follows. A stream flows into the lake with a re-
sulting delta formation. As the stream flows partly through fertile
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